The "eventedit" demo uses material theme, which doesn't show placeholders for fields. I cannot reproduce it with "New event" text inside as on your screenshot.
If you try it with another example, let's say, with "basic" one, you'll see that. As well as if you replace the theme for "eventedit" example to "stockholm".
It turns out that my problem is when I create an event, but when I edit an event, there is indeed no placeholder (that's what I want). In this screenshot, the placeholder is not what I want and it's been made in the "basic" example (https://bryntum.com/examples/calendar/basic/)
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Screenshot taken in the "basic" example
placeholderCreationBasicExample.png (41.64 KiB) Viewed 1040 times